RE: Bow Brand
First off, welcome to the forum and bow hunting!
You should take the bow to a local pro shop and have them check the bow over.
Have them check your draw length and make sure the bow is set up correctly for you.
This will be a lot of help for you in developing proper shooting form.
Take any arrows you have,don't know if it came with arrows or not, and have them make sure that they are the proper length and spine for your set up.
This will be time/money well spent!